Holder for inlays, tooth crowns, and the like



July-22, 1930. K, DEHE i 1,771,327

HOLDER FOR INLAYS, TOOTH CROWNS, AND THE LIKE Filed Feb. 23, 1928 Patented `July 22, 179'3 UNITED STATES KARL BERNE, or BURGSTADT, GERMANY' HOLDER, FOR INLAYS, TOOTH CROWNVS, AND THE LIKE Application fired February as, 192s, seriai Neasden, and i1; Gemanynarcn i7, 1927'.

This invention relates to a holder intended chiefly for inlays and tooth-crowns which in most cases consist of a precious metal.: The holder must be so designed that it allows an easy clamping in, as well as unclamping, of the work-piece because this latter must be repeatedly taken out of the holder in order cal section through a holder intended principally for inlays and combined with a platelike hood placed thereupon, the section (without this hood) being taken on the line I-I of Fig. 2; Fig. 2 is a planview` of the holder (without the hood) Fig. 3 is a plan view of the complete devicel (holder proper and hood) ;,Fig. 4 is a horizontal section on the line 4 4 of Fig. Vl; Fig. 5 is a View similar to Fig.` 1 and shows a holder intended j principally for, the clamping in of a toothcrown, also combined with a hood-forming plate; Fig. 6 is a planview of the holder Y shownin Fig. 5 (the hood-forming plate being removed); Fig. 7 -is avertical section through another modification taken on the line 7-7 of Fig. 8, and Fig. 8 a plan view ci the same.

. Referring to Figs. L4, the holder consists of ar plate a provided with a grip 76., as well as withaV recess in which a spiral spring is housed'. In the example shown in Fig. l (also in the modilication illustrated'in Fig. 5) said spring consists of a steel band. One end of the spring?) is aliixed Vto a pivot c on the platea and its otherrend to a pivot c pertaining to a disk cl which can be turned upon the suitably projecting center portion or neck-forming portion a of the plate a. The disk cl is provided with a grip e and in it are three curved slots f by means of which arms gare guided by the intermediary of pins 7L, At the ends of these armsare gripping jaws m, andthey are rotatable ron pivots z' projecting upwardly from the plate a.

In working postion,thatis to 4say when thegripper j aws' keep the inlay clamped in, the spring b `is under tension. VVhenfthe work-piece isl to be removed from the holder, the grip c of the disk d is turnedin the direction toward the-grip la of the plate a, as indicated by the arrow in Fig. 3, whereby the gripping jaws m are withdrawn from the work-piece Z. ln order to clamp in the workpiece again after it lhas been reinserted into thej holder, the gripeY is againtnrned suitably so asto move the grippersasunder and is'then released when it will be moved back into its former position by the spring l' The work-piece is now again held inproperworking position by the pressure exertedupon it by the spring bythe intermediary ofV the pins L.

The curved slots 7 of the rotatable disk d can also extend reversely to the direction in which they extend in Fig. 2, as shown in Fig. 6, which pertains to the modification Fig. 5 as already stated in the short description. In this case the device is suited as a crownholder. Crowns have, as is known, the shape of a hollow cylinder. Thegripping jaws t are moved radially` inwardly when the disk l is turned in that direction in which the spring Z) is placed under tension so that the hollow work-piece can be placed upon the suitably shaped gripping jaws m of the arms g'. When then the grip e is let loose so as to release the disk (Z, the spring tends to move the jaws inwardly whereby the crown is clamped fast bythenn i The spiral spring may` be wound also `in the reverse direction, as inFig. 4. The disk CZ with its slot f remains as'it was, but in order to place the. spring under tension theV disk must be turned in the other direction as will be obvious without a more detailed description. j Y

ln Figs. 7 and 8 a constructional form is shown in which the. gripping jaws are' secured to slides pguided in straight radial slots g of circular top member r forming a i cover of, or .hood for, the-plate o. There 4is also inl this case a rotatable disk al with curved slots f guiding pivots z, extending downwardly from said slides. The cover or hood 7" is secured to the plate a by screws 0. For the rest, the arrangement and combina- Y tion of the parts is the same as in Figs. 5 and 6. rlhe cover or hood is preferably provided with an upwardly extending rim V`s which lserves as a protecting member for the parts it surrounds and turnsy the cover-or 10 hood into a kind of basin in which the gold dust can be collected.

I claim: A holding device for inlays, crowns and the like comprising a plate having a neck .forming portionVV and a recess surrounding said portion; a disk mounted to rotate around the neck forming portion and having a plurality of slots therein; a spiral spring mounted in said recess having one end fixed to the plate and the yother end to the disk; a plurality of arms pivoted at one end on the plate and having a jaw at the other end adapted to hold the inlays, said arms being guided by the slots; means for operating the disk to open and close the jaws under the action of the spring; and a covering plate on lthe first-mentioned plate having 'a central opening through which the jaws project and having an upwardly directed rim so that said covering' plate will actas a collecting basin. n y Y In testimony whereof Irhave aiixed my signature. Y

' Y KARL DEI-INE. 

